Multiple paternity and complex fertilisation dynamics in the squid Loligo vulgaris reynaudii

Shaw, Paul W.; Sauer, W. H. H.

doi:10.3354/meps270173

Cited by 55 publications

(72 citation statements)

References 11 publications

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“…Specifically, these results support findings by Cigliano (1995) and Wada et al (2010) in that some male cephalopods appear to strategically regulate their copulation time based on the mating history of the female, presumably to maximise their reproductive output by balancing both their chance of paternity and their ability to successfully copulate with other females. Sperm competition appears prevalent among cephalopod mating systems (Cigliano, 1995;Hanlon et al, 1999;Naud et al, 2004;Shaw & Sauer, 2004;Wada et al, 2005b;Wada et al, 2006;Buresch et al, 2009;Wada et al, 2010;Iwata et al, 2011;Sato et al, 2013). Future studies using molecular markers might identify correlations between paternity and behavioural patterns including copulation duration and chronology.…”

Section: Resultsmentioning

confidence: 99%

Nocturnal mating behaviour and dynamic male investment of copulation time in the southern blue-ringed octopus, Hapalochlaena maculosa (Cephalopoda: Octopodidae)

Morse

Zenger

McCormick

et al. 2015

Behav

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The southern blue-ringed octopus, Hapalochlaena maculosa (Hoyle, 1883) is a nocturnal species that exhibits a mating system in which females hold sperm from multiple males over a one to two month breeding window before laying a single egg clutch. Contrary to most studied animal mating systems where anisogamy exists, gamete package production is limited for both males and females of this species (~50 spermatophores/eggs). This presents an animal model for studying aspects of sperm competition and dynamic mate choice behaviours. The present study reports on the mating behaviour of H. maculosa observed under laboratory conditions using infrared closed-circuit television video footage. Rates of male copulation attempts increased with male size, while female receptivity to mating attempts increased with female size, resulting in larger animals of both sexes gaining more copulations and spending more time per day in copulation. There was some evidence of female preference of larger males, but no male preference of females based on measured morphological traits. Both sexes terminated copulations in equal frequencies but male-terminated copulations were significantly shorter in duration. Males were more likely to terminate copulation early with females they had previously mated with, however were less likely to do so if the female had recently mated with a different male. Among male-terminated copulations, males mated for longer with females that had previously mated with other males in the trial. Male-male mounts were as common as male-female mounts, suggesting that male H. maculosa are not able to discriminate the sex of conspecifics. These findings suggest male strategic allocation of spermatophores based female mating history is an important factor influencing mating behaviours of this species.ADDITIONAL KEYWORDS: mate choice -Octopus -operational sex ratio -sperm competition.

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Section: Resultsmentioning

confidence: 99%

Nocturnal mating behaviour and dynamic male investment of copulation time in the southern blue-ringed octopus, Hapalochlaena maculosa (Cephalopoda: Octopodidae)

Morse

Zenger

McCormick

et al. 2015

Behav

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“…Multiple paternity has been reported in other loliginid species, and those studies show that paternities of each male are asymetric, e.g. one of the males sired most of the eggs in a capsule (Buresch et al 2001, Emery et al 2001, Shaw & Sauer 2004. Field observations have shown that large loliginid males guard females after copulation , and, in L. vulgaris reynaudii, a male that guarded a pre-spawning female had a high parentage rate (Shaw & Sauer 2004).…”

Section: Discussionmentioning

confidence: 99%

“…one of the males sired most of the eggs in a capsule (Buresch et al 2001, Emery et al 2001, Shaw & Sauer 2004. Field observations have shown that large loliginid males guard females after copulation , and, in L. vulgaris reynaudii, a male that guarded a pre-spawning female had a high parentage rate (Shaw & Sauer 2004). If the last male to mate fertilizes the most eggs, postcopulatory-guarding behavior is an effective strategy for that male to increase his fitness even with the guarding cost (Yamamura 1986 sperm precedence in loliginid squids are not known, but behavioral observations predict that the final male to mate before a female spawns will sire the most eggs .…”

Section: Discussionmentioning

confidence: 99%

“…Furthermore, the sperm usage mechanism is more complex in loliginid squids because they have 2 sperm storage sites (seminal receptacle and opening of oviduct). Shaw & Sauer (2004) found that in Loligo vulgaris reynaudii capsules, the distribution of offspring sired by different males is not random, suggesting that sperm from different males are not mixed within sperm storage organs and/or between the 2 sperm storage sites. In the present study, the fertilization rates of the most successful male and the other males did not differ significantly among egg capsules with multiple paternity in either Trial A or Trial B, suggesting that the paternity ratio of the final male to mate in the male-parallel position to the total of previous mates would be constant.…”

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confidence: 99%

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Dependance of paternity rates on alternative reproductive behaviors in the squid Loligo bleekeri

Iwata¹,

Munehara²,

Sakurai³

2005

Mar. Ecol. Prog. Ser.

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The mating behavior of captive Loligo bleekeri and the paternity of the resulting progeny were examined based on behavioral observations and genetic analyses. In this species, there are 3 mating behaviors (male-parallel, head-to-head, and extra-pair), and 2 sperm storage sites in females (seminal receptacle and the opening of the oviduct), which suggest that sperm competition occurs. All 3 mating behaviors were observed, and females mated often with different males, resulting in multiple paternity within 3 of the 4 broods examined. In each brood, the male to mate last and frequently before the female spawned fertilized the most eggs (87 to 100%). A sneaker male that mated by extra-pair copulation sired 8.5% of the eggs in a brood. Some eggs were fertilized by sperm received before the start of the study, indicating that sperm can be stored for at least several days before a spawning. In the broods with multiple paternity, the paternity patterns differed among egg capsules. Male competition was more intense between similar-sized males than between differentsized males, but body size did not affect the copulative success in the male-parallel position. We found multiple mating and multiple paternity in L. bleekeri. Paternity rates differed depending on the complex of factors, mating position, timing, frequency and duration. Alternative reproductive behaviors would change these factors and lead to different paternity rates.KEY WORDS: Multiple paternity · Reproductive strategy · Squid · Loligo · Microsatellite · Sperm competition Resale or republication not permitted without written consent of the publisherMar Ecol Prog Ser 298: [219][220][221][222][223][224][225][226][227][228] 2005 just before she spawns . These consort males guard females before and after copulation and while the females spawn, but sometimes large intruders replace the consort males and copulate with the females . Furthermore, extra-pair copulations (EPCs) also occur, in which a small 'sneaker male' copulates with a female that is paired with another male by attaching spermatophores near the female's mouth (Hanlon 1996. The spermatozoa are stored until they are released at spawning, so loliginid females can use spermatozoa from several males when they spawn.When squids spawn, eggs are extruded from the oviduct and pass through the funnel to a position near the mouth. The eggs can be fertilized either as they leave the oviduct, by spermatozoa placed in the mantle cavity during a male-parallel mating, or near the mouth, by spermatozoa stored in the seminal receptacle after a head-to-head mating or EPC. This difference in the fertilization mechanism will presumably affect the reproductive success of each copulative behavior and play a role in sexual selection (Birkhead & Møller 1998).If the reproductive success of each copulative behavior differs, males will compete to mate in the favorable position. Agonistic behavior between males has been shown to escalate through several phases, from visual signaling to physical contact (DiMarco & Ha...

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“…As a result, the majority of research on the chokka squid has focused on inshore spawning, i.e. environmental effects on spawning (Augustyn, 1990, Roberts, 1998, 2005Roberts & Sauer, 1994;Roberts & van den Berg, 2002, 2005Sauer et al , 1992, the impact of fishing on spawning concentrations (Hanlon et al, 2002;Oosthuizen et al, 2002a;Sauer, 1995;Schön et al 2002), biological studies (Augustyn 1990;Lipinski & Underhill, 1995;Olyott et al, 2006;Roel et al, 2000;Sauer & Lipinski, 1990;Sauer, 1995;Sauer et al, 1992Sauer et al, , 1999, life cycle (Augustyn, 1990(Augustyn, , 1991Olyott et al 2007;Roberts & Sauer, 1994), feeding on the spawning grounds (Augustyn, 1990;Sauer & Lipinski, 1991;Sauer & Smale, 1991Sauer et al, 1992), spawning behaviour (Hanlon et al, 1994(Hanlon et al, , 2002Sauer, 1995;Sauer et al 1992Sauer et al , 1997Shaw & Sauer, 2004), the inshore spawning environment (Augustyn, 1990;Roberts, 1998Roberts & Sauer, 1994;Roberts and van den Berg, 2002;Sauer et al , 1992, the location of spawning grounds (Augustyn, 1990;…”

Section: Introductionmentioning

confidence: 99%

The Use of Acoustic Telemetry in South African Squid Research (2003-2010)

Downey¹,

Webber²,

Roberts³

et al. 2011

Modern Telemetry

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Modern Telemetry 424 development of acoustic telemetry systems allowed researchers to overcome many limitations, it has also opened up new avenues of research. Initial telemetry experiments, conducted in 1993(Sauer et al., 1997, made use of a four buoy radio-linked acoustic positioning system and simple acoustic transmitters. The use of this then "unorthodox technique" (Sauer et al., 1997) led to the discovery that the formation of spawning aggregations and mating behaviours is well organized in time and space. The advancement of telemetry systems has enabled researchers to apply this technique to many different areas of research. This chapter describes and compares the various telemetry systems used in South African squid research from 2003 to date. These studies aimed to: 1. further our knowledge of inshore (20-70 m) spawning behaviour 2. determine the effect of upwelling and turbidity events on spawning 3. investigate movement on the inshore spawning grounds 4. investigate nocturnal behaviour 5. monitor the presence and movement of predators on the inshore spawning grounds 6. investigate movement on the deep spawning grounds (71-130 m) Also described are the types of transmitters used and the various transmitter attachment techniques developed, which are dependent on the species being tagged.

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Multiple paternity and complex fertilisation dynamics in the squid Loligo vulgaris reynaudii

Cited by 55 publications

References 11 publications

Nocturnal mating behaviour and dynamic male investment of copulation time in the southern blue-ringed octopus, Hapalochlaena maculosa (Cephalopoda: Octopodidae)

Nocturnal mating behaviour and dynamic male investment of copulation time in the southern blue-ringed octopus, Hapalochlaena maculosa (Cephalopoda: Octopodidae)

Dependance of paternity rates on alternative reproductive behaviors in the squid Loligo bleekeri

The Use of Acoustic Telemetry in South African Squid Research (2003-2010)

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